A person that seemingly stalks and lives to write comments trashing or making fun of items you post on Facebook. This includes a buddy that will twist the post to bring up embarrassing situations about you.
Post: "Just had a great dinner at a new French restaurant."
Comment: "Was it like that time you took that chick you met on the internet to dinner and brought her home only to find out it was a transvestite?"
Reply: "Dude, don't be a fassassin."